funny sound used by crazy people when they are angry.a very cool sound which is very hard to master and requires years and years of practice. some are born with the talent while others must spend years of training.

mark: guess what
crazy person: what?
mark: CHICKEN BUTT! HAHA
crazy person: ipogi!
mark: wow thats a cool sound. i wish i could do it. can you teach me?
crazy person: ahh. ooga booga ipogi.
mark: i take that as a no...